Seed Advantages in Angiosperms — NEET Biology
📚 Practice ConceptSeeds offer several advantages to angiosperms. Firstly, since reproductive processes such as pollination and fertilisation are independent of water, seed formation is more dependable. Also seeds have better adaptive strategies for dispersal to new habitats and help the species
Which of the above statements are NOT correct? S1: The androecium and gynoecium are classified as essential floral whorls because they directly participate in the formation of gametes and subsequent fertilisation. S2: Apomixis is a process observed exclusively in lower plants, where seeds are formed without the prior event of fertilisation. S3: Parthenocarpic fruits, typically seedless, are always the result of natural genetic mutations in certain angiosperm species. S4: While flowers are the sites of sexual reproduction, certain angiosperms can also develop seeds through asexual means like apomixis within the flower's structure. S5: The structural diversity of flowers and floral parts in angiosperms primarily reflects adaptations for ensuring efficient vegetative propagation in various habitats.
View solution & NCERT explanation
Correct answer: B — S2, S3 and S5 only
The core concept tested relates to the essential floral whorls and the various reproductive strategies in angiosperms, including asexual reproduction like apomixis and parthenocarpy. S1: This statement is correct. The androecium (male reproductive organ) and gynoecium (female reproductive organ) are directly involved in gamete production and fertilisation, making them essential whorls for reproduction. S2: This statement is incorrect. Apomixis is observed in 'a few flowering plants such as some species of Asteraceae and grasses,' not exclusively in lower plants. S3: This statement is incorrect. While parthenocarpic fruits are typically seedless, they can be 'induced through the application of growth hormones' and are not always the result of natural genetic mutations. S4: This statement is correct. Apomixis is explicitly defined as a 'form of asexual reproduction that mimics sexual reproduction' and results in seeds without fertilisation in flowering plants. S5: This statement is incorrect. The structural diversity of flowers and floral parts is primarily adapted 'to ensure formation of the end products of sexual reproduction, the fruits and seeds,' not efficient vegetative propagation. Therefore, statements S2, S3, and S5 are NOT correct.
What does NCERT say about Seeds offer several advantages?
Has this concept appeared in NEET?
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